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blogd



SYNOPSIS

       /sbin/blogd [/dev/realtty]


DESCRIPTION

       Without  argument  blogd  determines  the  real underlying
       character device of /dev/console.  blogd spawns a  pty/tty
       pair  to reconnect the current /dev/console with the slave
       of the pty/tty pair. During writing information from  this
       slave  to  the real character device a ring buffer is used
       to hold the information for writing it to an existing log­
       ging file.

       To fetch the real tty of /dev/console the program showcon­
       sole(8) can be used. This has  the  advantage  that  blogd
       will not hold the real character device of /dev/console as
       its controlling tty (would hangup  any  running  getty  on
       that character device).


SIGNALS

       blogd knows a few signal to contol its behavior.

       SIGQUIT, SIGINT, and SIGTERM
              will cause blogd tries to write out the ring buffer
              and to exit.

       SIGIO  says  blogd  that  now  it  is  able  to  write  on
              /var/log/boot.msg  which means that the file system
              is mounted read/write and the kernel  messages  are
              written to that file.


BUGS

       blogd  needs  a mounted /proc and /dev/pts file system and
       tries to set the controlling tty  to  stdin  if  the  real
       character  device  of  /dev/console  is  not given.  After
       reading /proc blogd tries to restore  the  status  of  the
       controlling  tty  to  avoid problems with getty processes.
       This can fail because blogd forks to run in the background
       as a daemon.


FILES

       /proc/<pid of blogd>/stat
              the stat file of the blogd process.

       /dev/console
              the system console.

       /var/log/boot.msg
              logging  file  which  is  created  by  klogd(8)  or
              dmesg(8).


SEE ALSO

       showconsole(8), syslogd(8), klogd(8), dmesg(8), proc(5).
  




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